You ought not to have her the piano all the time A play B to

c ,all the time,playing表经常发生的动作或状态 再问： 老师给的答案是Aplay耶 再答： have sb do sth / have sb doing sth You should not have your machine working all night long。 你再仔细问一下你们老师吧，把它弄懂。